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Loss of Power & Whistling Noise in 2017 Encore Turbo

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Ashley M. · rep 0 · May 22, 3:54 AM · 1 replies · solved · Question

Vehicle: 2017 Buick Encore Preferred

My 2017 Buick Encore Preferred, with about 70,000 miles, has recently developed a noticeable loss of power, especially on acceleration. It feels sluggish and struggles to get up to speed on the highway.

In addition to the power loss, I also hear a distinct whistling sound coming from the engine bay, which gets louder under load or when accelerating. It's not a belt squeal, more like a high-pitched whistle.

Could this be related to the turbocharger? What should I check first, or is this something that definitely needs a professional diagnosis?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:54 AM

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ClearTheCode admin answer:

Your symptoms of power loss and a whistling noise in a turbocharged 2017 Buick Encore strongly suggest an issue with the turbocharger system. Here's a breakdown of potential causes and what to do:

  1. Turbocharger Failure:
    • Whistling Noise: Often indicates a failing turbocharger bearing or a leak in the intake/charge air system.
    • Loss of Power: A failing turbo can't properly pressurize the intake air, leading to a significant reduction in engine power.
  2. Common Causes:
    • Boost Leaks: Hoses or clamps in the turbo system can crack or come loose, allowing boost pressure to escape. This is a common cause of whistling and power loss.
    • Wastegate Actuator Issues: The wastegate controls exhaust flow to the turbo. If it's stuck open or malfunctioning, the turbo won't build boost effectively.
    • Oil Supply Issues: Lack of proper oil lubrication can damage turbo bearings.
    • Foreign Object Damage: Debris entering the turbo can damage the compressor or turbine wheels.
  3. Potential OBD Codes: If your check engine light is on, common codes related to turbo issues include:
    • P0299: Turbocharger/Supercharger Underboost
    • P0234: Turbocharger/Supercharger Overboost (less likely with power loss)
    • P0033/P0034: Turbocharger Bypass Valve Control Circuit

When to See a Shop: Given the symptoms, it's highly recommended to have your vehicle inspected by a qualified mechanic as soon as possible. Continuing to drive with a failing turbo can lead to further engine damage. A technician can perform a boost pressure test, inspect the turbo and associated plumbing for leaks, and check for relevant diagnostic trouble codes to pinpoint the exact problem.

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